﻿210 
  Mr. 
  G. 
  Uollman 
  on 
  

  

  XXI. 
  — 
  Desrription 
  of 
  a 
  new 
  Genus 
  of 
  Molossine 
  Bats 
  from 
  

   West 
  Africa. 
  By 
  Guy 
  Dollman, 
  B.A. 
  

  

  (Published 
  by 
  permission 
  of 
  the 
  Trustees 
  of 
  the 
  British 
  Museum.) 
  

  

  AMONG 
  a 
  collection 
  of 
  West-African 
  mammals 
  recently 
  

   presented 
  to 
  the 
  British 
  Museum 
  by 
  Dr. 
  H.G. 
  F. 
  Spurrell 
  is 
  

   a 
  bat 
  representing 
  a 
  new 
  genus 
  of 
  the 
  family 
  Molossidaj. 
  

  

  XlPHONYCTERIS, 
  gen. 
  110 
  V. 
  

  

  Size 
  similar 
  to 
  that 
  of 
  the 
  smaller 
  species 
  of 
  Nyctinomus. 
  

   Wings 
  small, 
  membranous 
  area 
  much 
  reduced. 
  Ears., 
  feet, 
  

   and 
  tail 
  much 
  as 
  in 
  Nyctinomus. 
  

  

  Skull 
  with 
  median 
  anterior 
  palatal 
  emargination 
  like 
  that 
  

   of 
  Nyctinomus, 
  but 
  emargination 
  quite 
  small 
  and 
  incon- 
  

   spicuous, 
  though 
  extending 
  behind 
  roots 
  of 
  incisors. 
  Teeth 
  

   according 
  to 
  the 
  following 
  formula: 
  — 
  

  

  • 
  1—1 
  1—1 
  2—3 
  3-3_ 
  QQ 
  

  

  *■ 
  i_i> 
  c 
  - 
  i-v 
  P' 
  2— 
  2> 
  m 
  ' 
  3-3 
  — 
  ^°' 
  

  

  Upper 
  incisors 
  quite 
  small 
  and 
  closely 
  in 
  contact 
  with 
  

   canines; 
  widely 
  separated 
  from 
  each 
  other, 
  wider 
  apart 
  at 
  

   base 
  than 
  at 
  tip. 
  Upper 
  canine 
  rather 
  similar 
  to 
  that 
  of 
  

   Nyctinomus, 
  but 
  with 
  cingulum 
  very 
  prominent 
  and 
  shaft 
  of 
  

   tooth 
  longer, 
  much 
  flatter 
  anteriorly, 
  and 
  pointing 
  slightly 
  

   outwards. 
  Base 
  of 
  canines 
  much 
  enlarged, 
  the 
  anterior 
  edges 
  

   of 
  the 
  cingula 
  on 
  a 
  level 
  with 
  the 
  anterior 
  limit 
  of 
  the 
  upper 
  

   incisors 
  ; 
  when 
  looked 
  at 
  from 
  above 
  the 
  cingula 
  appear 
  as 
  two 
  

   prominent 
  crescentic 
  ridges 
  with 
  the 
  minute 
  incisors 
  between 
  

   them, 
  the 
  incisors 
  being 
  so 
  placed 
  as 
  to 
  resemble 
  two 
  antero- 
  

   internal 
  cusps 
  on 
  the 
  cingula 
  of 
  the 
  canines. 
  Behind 
  the 
  shaft 
  

   the 
  cingulum 
  is 
  expanded 
  to 
  form 
  a 
  large 
  flat 
  area, 
  its 
  posterior 
  

   edge 
  closely 
  in 
  contact 
  with 
  the 
  small 
  anterior 
  premolars. 
  

   Upper 
  premolars 
  and 
  molars 
  as 
  in 
  Nyctinomus, 
  the 
  molars 
  

   with 
  well-developed 
  hypocones. 
  Lower 
  incisors 
  reduced 
  to 
  a 
  

   single 
  pair 
  of 
  very 
  minute 
  functionless 
  teeth, 
  bridged 
  over 
  by 
  

   the 
  junction 
  of 
  the 
  lower 
  canines 
  ; 
  cutting-edges 
  deeply 
  bifid. 
  

   Lower 
  canines 
  with 
  well-developed 
  cingula, 
  forming 
  ante- 
  

   riorly 
  prominent 
  secondary 
  cusps, 
  which 
  meet 
  together 
  in 
  

   the 
  mid-line 
  as 
  a 
  bridge 
  over 
  the 
  minute 
  incisors 
  ; 
  posterior 
  

   portion 
  of 
  cingulum 
  large 
  and 
  well 
  developed, 
  much 
  more 
  so 
  

   than 
  in 
  the 
  allied 
  genera. 
  Lower 
  molars 
  and 
  premolars 
  as 
  

   in 
  Nyctinomus. 
  

  

  Tv 
  pe, 
  Xiphonycteris 
  spurrelH. 
  

  

  This 
  genus 
  would 
  appear 
  to 
  be 
  most 
  nearly 
  related 
  to 
  the 
  

  

  